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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2017
Intangible Assets  
Intangible assets

Amortization expense for the nine months ended September 30, 2017 and 2016 was $10.2 million and $10.3 million, respectively. These costs are amortized to depreciation, depletion, and amortization expense in our consolidated statement of operations.  Intangible assets as of September 30, 2017, and December 31, 2016 are detailed below (in thousands):

 

 

 

 

 

 

 

 

 

 

September 30, 

 

December 31, 

 

 

2017

    

2016

Beginning balance

 

$

185,766

 

$

199,741

   Disposals

 

 

(32)

 

 

(219)

   Amortization

 

 

(10,204)

 

 

(13,756)

Ending balance

 

$

175,530

 

$

185,766